Repulsive and attractive ferroglasses: a SAXS and XPCS study

AUTOR(ES)

Wandersman, E., Chushkin, Y., Dubois, E., Dupuis, V., Demouchy, G., Robert, A., Perzynski, R.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2009-04

RESUMO

A dynamical freezing, which is the analogous of a glass transition, is observed at large concentrations in aqueous dispersions of maghemite nanoparticles. We study experimentally the structure and the dynamical properties of two dense ferroglass-formers in two very distinct states of interparticle interaction, either strongly repulsive or attractive. The static structure of the magnetic colloidal dispersions is probed by means of Small Angle X-ray Scattering both in and without the presence of an external magnetic field. Translational dynamics of the repulsive glassformer are investigated by X ray Photon Correlation Spectroscopy. Slow dynamics and aging properties, which both become anisotropic under an applied field, are here investigated.

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